An easy way to solve this is to have a permanent data explorer that shows you your own FB data, but through the lens of each entity you've shared it with, and a

An easy way to solve this is to have a permanent data explorer that shows you your own FB data, but through the lens of each entity you've shared it with, and a one click opt out. Maybe a list of entities, and when you click on one, you see what they would see. If you care, you opt out. If you don't, you do not opt out. Either way, it makes it hard to plead ignorance or vagueness of permission dialog text.